I'll fess up first...my flashed ECU came yesterday and I held out on y'all to get another ride in today. Total mileage so far is ~100. With work and the time available, my (two) rides have been limited to my favorite twisty back roads so there hasn't been much opportunity for higher speeds.
Hard for me to put the description in words. First, rest assured we didn't lose any of that wonderful low end torque.The flash simply builds on that and continues to pull harder all the way up. My '15 has GYTR (Yoshimura) slip-ons. Wife says the bike has a different (throatier) sound now. I agree. Engine *feels* more willing, alive, playful...ready to rev. Riding it feels like a race-horse straining at the reins, poised and ready to run.
Driveability is improved. The off-on throttle transition is much better than stock. I purposely slowed down more than normal for a couple 2nd gear corners, the transition back to throttle was flawless. My '15 has never been particularly smooth, always had a tingle through the bars. Removing the HVMP bar ends and adding VStrom hand guards helped dampen things down. Bar vibration / tingle *seems* to be reduced even further. I would say it's now on par with a C14 for smoothness.
The third drive mode ROCKS. Linear throttle, not as stupid aggressive as Sport but allows a smooth controlled rush as the revs build. It's going to be my new favorite! Touring and Sport modes keep the same throttle response but with better feel due to the new fuel/ignition maps. Overall the engine is smooth and responsive regardless of which drive mode is running. Cruise control works, no feel for fuel mileage yet with the short rides.
So in a nutshell that's it. Ivan's FJR flash is here and it works. Post up any questions and I'll answer best I can!
--G